These engines are amazing!! I get 7-9 gallons out of them. they are crazy fast with killer runtime. They have a ton of bottom and screaming top. Also the internals last the life of the engines. No bearing ,or rod changes neccesary. And I have owned and wore out many of these and they do not have carb issues. Or any other issues for that matter. Great engine for truggy and buggy. Hands down the fastest most reliable racing engine you can get for this price. -//- Update, got over 3 gallons thru mine. Best engine I have ever run more bottom than a V-Spec and killer top!! NEver flames out even in 30 and 45 minuts mains Super reliable and easy to tune. Have not had to mess with my needles much at all and Xlnt mileage. Big bottom great for truggies. No need to mess with your clutch to get punch on this engine. Bearings and rod still perfect! 2013 has most punch and great top, 2057 smooths out the powerband and has a bit more top. Cant say enough about this engine!! -//- Killer engine!! Got a gallon thru it, runs cool, has tons of bottom end and top end and gets 11-12 minutes runtime in my D8T truggy with werks 30% and a 2013 pipe. Very reliable and fast engine. Just as fast as my $300+ dollar engines and better runtime!